CVE-2024-50595Public exploitNetwork attack vector

Service interruption via PUT length underflow

Published Apr 2, 2025 · Updated Nov 3, 2025

Integer underflow in the NetX Duo HTTP server in X-CUBE-AZRTOS packages allows remote authenticated users to cause a service interrupt. The PUT handler subtracts a larger received-packet length from an unsigned Content-Length without validating the relationship, wrapping the remainder to 0xffffffff. PUT processing must be enabled; continued data transmission writes an oversized file that consumes filesystem resources and interrupts the HTTP service.

CVSS severity4.3
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in the NetX Duo HTTP server in X-CUBE-AZRTOS packages allows remote authenticated users to cause a service interrupt. The PUT handler subtracts a larger received-packet length from an unsigned Content-Length without validating the relationship, wrapping the remainder to 0xffffffff. PUT processing must be enabled; continued data transmission writes an oversized file that consumes filesystem resources and interrupts the HTTP service.

The record

CVE
CVE-2024-50595
Published
Apr 2, 2025
Updated
Nov 3, 2025
Vendor
STMicroelectronics
Product
X-CUBE-AZRTOS-G4
Classifications
CWE-191, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

STMicroelectronics · X-CUBE-AZRTOS-G4version=2.0.0
STMicroelectronics · X-CUBE-AZRTOS-WLversion=2.0.0
STMicroelectronics · X-CUBE-AZRTOS-L5version=2.0.0
STMicroelectronics · X-CUBE-AZRTOS-F4version=1.1.0
STMicroelectronics · X-CUBE-AZRTOS-G0version=1.1.0
STMicroelectronics · X-CUBE-AZRT-H7RSversion=1.0.0
STMicroelectronics · X-CUBE-AZRTOS-L4version=2.0.0
STMicroelectronics · X-CUBE-AZRTOS-H7version=3.3.0
STMicroelectronics · X-CUBE-AZRTOS-WBversion=2.0.0
STMicroelectronics · X-CUBE-AZRTOS-F7version=1.1.0

Published CVSS scores

4.3Cisco TalosCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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